[Gmsh] Problem with Physical naming

[Alex Lindsay]

Hi,

I'm a very new user to gmsh. I'm trying to do naming similar to that 
done in the first tutorial, t1.geo:

    Physical Line("My third line (physical id 5)", 5) = {4} ;


My version:

    Physical Line("Plasma", 0) = {1,2,3};
    Physical Line("Liquid", 1) = {4,5,6,7};


yields this error when I try to mesh:

    Error   : 'liquid.geo', line 24 : syntax error (,)
    Error   : 'liquid.geo', line 25 : syntax error (,)


What am I doing wrong?
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